HD6413008F RENESAS [Renesas Technology Corp], HD6413008F Datasheet - Page 292
HD6413008F
Manufacturer Part Number
HD6413008F
Description
Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6413008F.pdf
(686 pages)
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9. 8-Bit Timers
9.2
9.2.1
Initial value
Read/Write
Initial value
Read/Write
The timer counters (8TCNT) are 8-bit readable/writable up-counters that increment on pulses
generated from an internal or external clock source. The clock source is selected by clock select
bits 2 to 0 (CKS2 to CKS0) in the timer control register (8TCR). The CPU can always read or
write to the timer counters.
The 8TCNT0 and 8TCNT1 pair, and the 8TCNT2 and 8TCNT3 pair, can each be accessed as a
16-bit register by word access.
8TCNT can be cleared by an input capture signal or compare match signal. Counter clear bits 1
and 0 (CCLR1 and CCLR0) in 8TCR select the method of clearing.
When 8TCNT overflows from H'FF to H'00, the overflow flag (OVF) in the timer control/status
register (8TCSR) is set to 1.
Each 8TCNT is initialized to H'00 by a reset and in standby mode.
Rev.4.00 Aug. 20, 2007 Page 248 of 638
REJ09B0395-0400
Bit
Bit
Timer Counters (8TCNT)
Register Descriptions
R/W
R/W
15
15
0
0
R/W
R/W
14
14
0
0
R/W
R/W
13
13
0
0
R/W
R/W
8TCNT0
8TCNT2
12
12
0
0
R/W
R/W
11
11
0
0
R/W
R/W
10
10
0
0
R/W
R/W
9
0
9
0
R/W
R/W
8
0
8
0
R/W
R/W
7
0
7
0
R/W
R/W
6
0
6
0
R/W
R/W
5
0
5
0
R/W
R/W
8TCNT1
8TCNT3
4
0
4
0
R/W
R/W
3
0
3
0
R/W
R/W
2
0
2
0
R/W
R/W
1
0
1
0
R/W
R/W
0
0
0
0
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